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534 lines
14 KiB
534 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* SCTP kernel implementation |
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* (C) Copyright Red Hat Inc. 2017 |
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* |
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* This file is part of the SCTP kernel implementation |
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* |
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* These functions implement sctp diag support. |
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* |
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* Please send any bug reports or fixes you make to the |
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* email addresched(es): |
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* lksctp developers <[email protected]> |
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* |
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* Written or modified by: |
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* Xin Long <[email protected]> |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/inet_diag.h> |
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#include <linux/sock_diag.h> |
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#include <net/sctp/sctp.h> |
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|
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static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, |
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void *info); |
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|
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/* define some functions to make asoc/ep fill look clean */ |
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static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r, |
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struct sock *sk, |
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struct sctp_association *asoc) |
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{ |
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union sctp_addr laddr, paddr; |
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struct dst_entry *dst; |
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struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer; |
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laddr = list_entry(asoc->base.bind_addr.address_list.next, |
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struct sctp_sockaddr_entry, list)->a; |
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paddr = asoc->peer.primary_path->ipaddr; |
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dst = asoc->peer.primary_path->dst; |
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r->idiag_family = sk->sk_family; |
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r->id.idiag_sport = htons(asoc->base.bind_addr.port); |
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r->id.idiag_dport = htons(asoc->peer.port); |
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r->id.idiag_if = dst ? dst->dev->ifindex : 0; |
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sock_diag_save_cookie(sk, r->id.idiag_cookie); |
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|
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#if IS_ENABLED(CONFIG_IPV6) |
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if (sk->sk_family == AF_INET6) { |
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*(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr; |
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*(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr; |
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} else |
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#endif |
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{ |
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memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src)); |
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memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst)); |
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r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr; |
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r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr; |
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} |
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r->idiag_state = asoc->state; |
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if (timer_pending(t3_rtx)) { |
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r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX; |
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r->idiag_retrans = asoc->rtx_data_chunks; |
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r->idiag_expires = jiffies_to_msecs(t3_rtx->expires - jiffies); |
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} else { |
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r->idiag_timer = 0; |
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r->idiag_retrans = 0; |
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r->idiag_expires = 0; |
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} |
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} |
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static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb, |
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struct list_head *address_list) |
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{ |
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struct sctp_sockaddr_entry *laddr; |
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int addrlen = sizeof(struct sockaddr_storage); |
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int addrcnt = 0; |
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struct nlattr *attr; |
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void *info = NULL; |
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list_for_each_entry_rcu(laddr, address_list, list) |
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addrcnt++; |
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attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt); |
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if (!attr) |
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return -EMSGSIZE; |
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info = nla_data(attr); |
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list_for_each_entry_rcu(laddr, address_list, list) { |
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memcpy(info, &laddr->a, sizeof(laddr->a)); |
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memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a)); |
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info += addrlen; |
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} |
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return 0; |
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} |
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static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb, |
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struct sctp_association *asoc) |
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{ |
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int addrlen = sizeof(struct sockaddr_storage); |
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struct sctp_transport *from; |
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struct nlattr *attr; |
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void *info = NULL; |
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attr = nla_reserve(skb, INET_DIAG_PEERS, |
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addrlen * asoc->peer.transport_count); |
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if (!attr) |
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return -EMSGSIZE; |
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info = nla_data(attr); |
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list_for_each_entry(from, &asoc->peer.transport_addr_list, |
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transports) { |
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memcpy(info, &from->ipaddr, sizeof(from->ipaddr)); |
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memset(info + sizeof(from->ipaddr), 0, |
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addrlen - sizeof(from->ipaddr)); |
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info += addrlen; |
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} |
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return 0; |
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} |
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/* sctp asoc/ep fill*/ |
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static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc, |
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struct sk_buff *skb, |
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const struct inet_diag_req_v2 *req, |
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struct user_namespace *user_ns, |
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int portid, u32 seq, u16 nlmsg_flags, |
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const struct nlmsghdr *unlh, |
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bool net_admin) |
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{ |
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struct sctp_endpoint *ep = sctp_sk(sk)->ep; |
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struct list_head *addr_list; |
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struct inet_diag_msg *r; |
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struct nlmsghdr *nlh; |
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int ext = req->idiag_ext; |
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struct sctp_infox infox; |
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void *info = NULL; |
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nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), |
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nlmsg_flags); |
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if (!nlh) |
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return -EMSGSIZE; |
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r = nlmsg_data(nlh); |
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BUG_ON(!sk_fullsock(sk)); |
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if (asoc) { |
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inet_diag_msg_sctpasoc_fill(r, sk, asoc); |
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} else { |
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inet_diag_msg_common_fill(r, sk); |
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r->idiag_state = sk->sk_state; |
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r->idiag_timer = 0; |
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r->idiag_retrans = 0; |
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} |
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if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin)) |
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goto errout; |
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if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) { |
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u32 mem[SK_MEMINFO_VARS]; |
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int amt; |
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if (asoc && asoc->ep->sndbuf_policy) |
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amt = asoc->sndbuf_used; |
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else |
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amt = sk_wmem_alloc_get(sk); |
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mem[SK_MEMINFO_WMEM_ALLOC] = amt; |
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if (asoc && asoc->ep->rcvbuf_policy) |
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amt = atomic_read(&asoc->rmem_alloc); |
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else |
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amt = sk_rmem_alloc_get(sk); |
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mem[SK_MEMINFO_RMEM_ALLOC] = amt; |
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mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; |
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mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; |
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mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; |
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mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; |
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mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); |
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mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len); |
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mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops); |
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if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0) |
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goto errout; |
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} |
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if (ext & (1 << (INET_DIAG_INFO - 1))) { |
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struct nlattr *attr; |
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attr = nla_reserve_64bit(skb, INET_DIAG_INFO, |
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sizeof(struct sctp_info), |
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INET_DIAG_PAD); |
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if (!attr) |
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goto errout; |
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info = nla_data(attr); |
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} |
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infox.sctpinfo = (struct sctp_info *)info; |
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infox.asoc = asoc; |
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sctp_diag_get_info(sk, r, &infox); |
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addr_list = asoc ? &asoc->base.bind_addr.address_list |
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: &ep->base.bind_addr.address_list; |
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if (inet_diag_msg_sctpladdrs_fill(skb, addr_list)) |
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goto errout; |
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if (asoc && (ext & (1 << (INET_DIAG_CONG - 1)))) |
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if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0) |
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goto errout; |
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if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc)) |
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goto errout; |
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nlmsg_end(skb, nlh); |
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return 0; |
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errout: |
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nlmsg_cancel(skb, nlh); |
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return -EMSGSIZE; |
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} |
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/* callback and param */ |
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struct sctp_comm_param { |
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struct sk_buff *skb; |
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struct netlink_callback *cb; |
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const struct inet_diag_req_v2 *r; |
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const struct nlmsghdr *nlh; |
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bool net_admin; |
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}; |
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static size_t inet_assoc_attr_size(struct sctp_association *asoc) |
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{ |
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int addrlen = sizeof(struct sockaddr_storage); |
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int addrcnt = 0; |
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struct sctp_sockaddr_entry *laddr; |
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list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list, |
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list) |
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addrcnt++; |
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return nla_total_size(sizeof(struct sctp_info)) |
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+ nla_total_size(addrlen * asoc->peer.transport_count) |
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+ nla_total_size(addrlen * addrcnt) |
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+ nla_total_size(sizeof(struct inet_diag_msg)) |
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+ inet_diag_msg_attrs_size() |
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+ nla_total_size(sizeof(struct inet_diag_meminfo)) |
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+ 64; |
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} |
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static int sctp_sock_dump_one(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p) |
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{ |
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struct sctp_association *assoc = tsp->asoc; |
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struct sctp_comm_param *commp = p; |
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struct sock *sk = ep->base.sk; |
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const struct inet_diag_req_v2 *req = commp->r; |
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struct sk_buff *skb = commp->skb; |
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struct sk_buff *rep; |
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int err; |
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err = sock_diag_check_cookie(sk, req->id.idiag_cookie); |
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if (err) |
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return err; |
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rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL); |
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if (!rep) |
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return -ENOMEM; |
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lock_sock(sk); |
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if (ep != assoc->ep) { |
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err = -EAGAIN; |
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goto out; |
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} |
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err = inet_sctp_diag_fill(sk, assoc, rep, req, sk_user_ns(NETLINK_CB(skb).sk), |
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NETLINK_CB(skb).portid, commp->nlh->nlmsg_seq, 0, |
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commp->nlh, commp->net_admin); |
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if (err < 0) { |
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WARN_ON(err == -EMSGSIZE); |
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goto out; |
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} |
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release_sock(sk); |
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return nlmsg_unicast(sock_net(skb->sk)->diag_nlsk, rep, NETLINK_CB(skb).portid); |
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out: |
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release_sock(sk); |
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kfree_skb(rep); |
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return err; |
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} |
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static int sctp_sock_dump(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p) |
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{ |
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struct sctp_comm_param *commp = p; |
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struct sock *sk = ep->base.sk; |
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struct sk_buff *skb = commp->skb; |
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struct netlink_callback *cb = commp->cb; |
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const struct inet_diag_req_v2 *r = commp->r; |
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struct sctp_association *assoc; |
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int err = 0; |
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lock_sock(sk); |
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if (ep != tsp->asoc->ep) |
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goto release; |
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list_for_each_entry(assoc, &ep->asocs, asocs) { |
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if (cb->args[4] < cb->args[1]) |
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goto next; |
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if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) && |
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r->id.idiag_sport) |
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goto next; |
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if (r->id.idiag_dport != htons(assoc->peer.port) && |
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r->id.idiag_dport) |
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goto next; |
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if (!cb->args[3] && |
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inet_sctp_diag_fill(sk, NULL, skb, r, |
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sk_user_ns(NETLINK_CB(cb->skb).sk), |
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NETLINK_CB(cb->skb).portid, |
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cb->nlh->nlmsg_seq, |
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NLM_F_MULTI, cb->nlh, |
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commp->net_admin) < 0) { |
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err = 1; |
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goto release; |
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} |
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cb->args[3] = 1; |
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if (inet_sctp_diag_fill(sk, assoc, skb, r, |
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sk_user_ns(NETLINK_CB(cb->skb).sk), |
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NETLINK_CB(cb->skb).portid, |
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cb->nlh->nlmsg_seq, 0, cb->nlh, |
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commp->net_admin) < 0) { |
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err = 1; |
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goto release; |
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} |
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next: |
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cb->args[4]++; |
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} |
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cb->args[1] = 0; |
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cb->args[3] = 0; |
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cb->args[4] = 0; |
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release: |
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release_sock(sk); |
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return err; |
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} |
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static int sctp_sock_filter(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p) |
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{ |
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struct sctp_comm_param *commp = p; |
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struct sock *sk = ep->base.sk; |
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const struct inet_diag_req_v2 *r = commp->r; |
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struct sctp_association *assoc = |
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list_entry(ep->asocs.next, struct sctp_association, asocs); |
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|
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/* find the ep only once through the transports by this condition */ |
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if (tsp->asoc != assoc) |
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return 0; |
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if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family) |
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return 0; |
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return 1; |
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} |
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static int sctp_ep_dump(struct sctp_endpoint *ep, void *p) |
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{ |
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struct sctp_comm_param *commp = p; |
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struct sock *sk = ep->base.sk; |
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struct sk_buff *skb = commp->skb; |
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struct netlink_callback *cb = commp->cb; |
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const struct inet_diag_req_v2 *r = commp->r; |
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struct net *net = sock_net(skb->sk); |
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struct inet_sock *inet = inet_sk(sk); |
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int err = 0; |
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if (!net_eq(sock_net(sk), net)) |
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goto out; |
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if (cb->args[4] < cb->args[1]) |
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goto next; |
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if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs)) |
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goto next; |
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if (r->sdiag_family != AF_UNSPEC && |
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sk->sk_family != r->sdiag_family) |
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goto next; |
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if (r->id.idiag_sport != inet->inet_sport && |
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r->id.idiag_sport) |
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goto next; |
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if (r->id.idiag_dport != inet->inet_dport && |
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r->id.idiag_dport) |
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goto next; |
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if (inet_sctp_diag_fill(sk, NULL, skb, r, |
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sk_user_ns(NETLINK_CB(cb->skb).sk), |
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NETLINK_CB(cb->skb).portid, |
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cb->nlh->nlmsg_seq, NLM_F_MULTI, |
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cb->nlh, commp->net_admin) < 0) { |
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err = 2; |
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goto out; |
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} |
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next: |
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cb->args[4]++; |
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out: |
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return err; |
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} |
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/* define the functions for sctp_diag_handler*/ |
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static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, |
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void *info) |
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{ |
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struct sctp_infox *infox = (struct sctp_infox *)info; |
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|
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if (infox->asoc) { |
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r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc); |
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r->idiag_wqueue = infox->asoc->sndbuf_used; |
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} else { |
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r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog); |
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r->idiag_wqueue = READ_ONCE(sk->sk_max_ack_backlog); |
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} |
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if (infox->sctpinfo) |
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sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo); |
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} |
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|
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static int sctp_diag_dump_one(struct netlink_callback *cb, |
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const struct inet_diag_req_v2 *req) |
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{ |
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struct sk_buff *skb = cb->skb; |
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struct net *net = sock_net(skb->sk); |
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const struct nlmsghdr *nlh = cb->nlh; |
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union sctp_addr laddr, paddr; |
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struct sctp_comm_param commp = { |
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.skb = skb, |
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.r = req, |
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.nlh = nlh, |
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.net_admin = netlink_net_capable(skb, CAP_NET_ADMIN), |
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}; |
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|
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if (req->sdiag_family == AF_INET) { |
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laddr.v4.sin_port = req->id.idiag_sport; |
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laddr.v4.sin_addr.s_addr = req->id.idiag_src[0]; |
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laddr.v4.sin_family = AF_INET; |
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|
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paddr.v4.sin_port = req->id.idiag_dport; |
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paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0]; |
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paddr.v4.sin_family = AF_INET; |
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} else { |
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laddr.v6.sin6_port = req->id.idiag_sport; |
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memcpy(&laddr.v6.sin6_addr, req->id.idiag_src, |
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sizeof(laddr.v6.sin6_addr)); |
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laddr.v6.sin6_family = AF_INET6; |
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|
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paddr.v6.sin6_port = req->id.idiag_dport; |
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memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst, |
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sizeof(paddr.v6.sin6_addr)); |
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paddr.v6.sin6_family = AF_INET6; |
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} |
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|
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return sctp_transport_lookup_process(sctp_sock_dump_one, |
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net, &laddr, &paddr, &commp); |
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} |
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|
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static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, |
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const struct inet_diag_req_v2 *r) |
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{ |
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u32 idiag_states = r->idiag_states; |
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struct net *net = sock_net(skb->sk); |
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struct sctp_comm_param commp = { |
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.skb = skb, |
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.cb = cb, |
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.r = r, |
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.net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN), |
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}; |
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int pos = cb->args[2]; |
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|
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/* eps hashtable dumps |
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* args: |
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* 0 : if it will traversal listen sock |
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* 1 : to record the sock pos of this time's traversal |
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* 4 : to work as a temporary variable to traversal list |
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*/ |
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if (cb->args[0] == 0) { |
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if (!(idiag_states & TCPF_LISTEN)) |
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goto skip; |
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if (sctp_for_each_endpoint(sctp_ep_dump, &commp)) |
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goto done; |
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skip: |
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cb->args[0] = 1; |
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cb->args[1] = 0; |
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cb->args[4] = 0; |
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} |
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|
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/* asocs by transport hashtable dump |
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* args: |
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* 1 : to record the assoc pos of this time's traversal |
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* 2 : to record the transport pos of this time's traversal |
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* 3 : to mark if we have dumped the ep info of the current asoc |
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* 4 : to work as a temporary variable to traversal list |
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* 5 : to save the sk we get from travelsing the tsp list. |
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*/ |
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if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE))) |
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goto done; |
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|
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sctp_transport_traverse_process(sctp_sock_filter, sctp_sock_dump, |
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net, &pos, &commp); |
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cb->args[2] = pos; |
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|
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done: |
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cb->args[1] = cb->args[4]; |
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cb->args[4] = 0; |
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} |
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|
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static const struct inet_diag_handler sctp_diag_handler = { |
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.dump = sctp_diag_dump, |
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.dump_one = sctp_diag_dump_one, |
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.idiag_get_info = sctp_diag_get_info, |
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.idiag_type = IPPROTO_SCTP, |
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.idiag_info_size = sizeof(struct sctp_info), |
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}; |
|
|
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static int __init sctp_diag_init(void) |
|
{ |
|
return inet_diag_register(&sctp_diag_handler); |
|
} |
|
|
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static void __exit sctp_diag_exit(void) |
|
{ |
|
inet_diag_unregister(&sctp_diag_handler); |
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} |
|
|
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module_init(sctp_diag_init); |
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module_exit(sctp_diag_exit); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);
|
|
|